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Glossary term: 盤狀星系

Description: 盤狀星系是一類星系,其特徵是擁有一個由恆星、氣體和塵埃組成的扁平結構,這些成分都圍繞星系中心做共面圓周運動。盤狀星系中通常存在螺旋臂及相關的恆星形成活動。在大多數星系分類體系中,盤狀星系與橢圓星系、不規則星系和矮星系有所區別。

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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
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This is an automated transliteration of the simplified Chinese translation of this term

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這個星系有一個巨大的凸起,周圍環繞著一圈塵埃,形成了與同名的墨西哥帽相似的圖像。

草帽星系

Caption: 由於這個著名的星系M104 與墨西哥帽子非常相似,因此經常被稱為 "草帽星系"。之所以,看起來是這個樣子,是由於我們觀測的視角幾乎平行著薄圓盤的平面,圓盤被星系中的隆起(bulge)所照亮。星系盤和隆起都含有恆星,但隆起中的恆星往往比較老。星系盤中藏有大量的塵埃和氣體,從而形成了陰影。M104 位於室女座,距離我們大約 50 光年。圖中可見的小點有些是前景恆星,有些是背景星系,但實際上大部分都是球狀星團,它們是與草帽星系相關的緻密大質量恆星團。
Credit: ESO/P.巴特爾 credit link

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